Various types of via wires VW will be described below in the present specification. Regarding a shape of the via wire VW, the via wire VW may pass through the wiring board 10 like the via wire VWA shown in FIG. 3 or may not pass through the wiring board 10 like the via wire VWA shown in FIG. 6. However, in the case of the via wire VW constituting a bandpass filter or a high-pass filter described later in the fourth embodiment, the via wire VW may function as a stub, in some cases. When, of the via wire VWA shown in FIG. 3, a length of a portion thereof from the wiring layer WL3 to the wiring layer WL4 is ? the wavelength of a frequency desired to be passed, for example, a signal current in such frequency band has difficulty in passing through the via wire VW due to resonance. In a case where a bandpass filter or a high-pass filter is connected, the via wire VW is used for transmitting a high-frequency signal, and accordingly, stub resonance may occur. For this reason, in a case where the via wire VW constitutes a bandpass filter or a high-pass filter, it is preferable that the via wire VW does not pass through the wiring board 10, like the via wire VWA shown in FIG. 6.
